Climate Change Data Portal
DOI | 10.1016/j.atmosres.2016.02.005 |
Chemical composition of size-segregated aerosols in Lhasa city, Tibetan Plateau | |
Wan, Xin; Kang, Shichang![]() ![]() | |
发表日期 | 2016 |
ISSN | 0169-8095 |
EISSN | 1873-2895 |
卷号 | 174 |
英文摘要 | To reveal the chemical characteristics of size-segregated aerosols in the high-altitude city of Tibetan Plateau, eight-size aerosol samples were collected in Lhasa from March 2013 to February 2014. The annual mean of online PM2.5 was 25.0 +/- 16.0 mu g m(-3), which was much lower than Asian cities but similar with some European cities. The annual mean concentrations of organic carbon (OC, 7.92 mu g m(-3) in PM2.1 and 12.66 mu g m(-3) in PM9.0) and elemental carbon (EC, 1.00 mu g m(-3) in PM2.1 and 1.21 mu g m(-3) in PM9.0) in Lhasa aerosols were considerably lower than those heavily polluted cities such as Beijing and Xi'an, China and Kathmandu, Nepal. Sulfate, NO3-, NH4+ and Ca-2(+) were 0.75 +/- 031, 0.82 +/- 0.35, 0.38 +/- 0.34 and 0.57 +/- 0.29 mu g m(-3) in fine particles while in coarse particles they were 0.57 +/- 037, 0.73 +/- 0.23, 0.07 +/- 0.03 and 2.52 +/- 137 mu g m(-3), respectively. Secondary water-soluble ions composed 35.8% of the total ionic components in fine particles according to the established electroneutrality, while in coarse particles they took up only 93%. Ca2+ (40.6%) was the major component of the coarse particles. For seasonality, the concentrations of OC, EC, SO42-, K+, Ca2+, Mg2+, Cl- and Na+ presented higher values during late autumn and winter but were relatively lower in spring and summer. Nevertheless, NOT was considerably higher in summer and autumn, presumably due to increased tourist-vehicle emissions. During winter and spring, [Ca2+]/[NO3-+SO4-] ratios in coarse particles showed higher values of 7.31 and 6.17, respectively, emphasizing the dust influence. [NO3-]/[SO42-] ratios in fine particles during spring, summer and autumn exceeding 1 indicated that the currently predominant vehicle exhaust makes a greater contribution to the aerosols. While more stationary sources such as coal and biomass burning existed in winter since the [NO3-]/[SO42-] ratio was less than 1. Different sources and formation processes lead to a bimodal size distribution (0-0.65 mu m in fine particles and 4.7-9.0 mu m in coarse particles) for all of the compounds except Na+. (C) 2016 Elsevier B.V. All rights reserved. |
关键词 | Atmospheric aerosolsOC/ECWSIsSize distributionLhasa |
学科领域 | Meteorology & Atmospheric Sciences |
语种 | 英语 |
WOS研究方向 | Meteorology & Atmospheric Sciences |
来源期刊 | ATMOSPHERIC RESEARCH
![]() |
来源机构 | 中国科学院西北生态环境资源研究院 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/111840 |
作者单位 | Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China |
推荐引用方式 GB/T 7714 | Wan, Xin,Kang, Shichang,Xin, Jinyuan,et al. Chemical composition of size-segregated aerosols in Lhasa city, Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2016,174. |
APA | Wan, Xin.,Kang, Shichang.,Xin, Jinyuan.,Liu, Bin.,Wen, Tianxue.,...&Cong, Zhiyuan.(2016).Chemical composition of size-segregated aerosols in Lhasa city, Tibetan Plateau.ATMOSPHERIC RESEARCH,174. |
MLA | Wan, Xin,et al."Chemical composition of size-segregated aerosols in Lhasa city, Tibetan Plateau".ATMOSPHERIC RESEARCH 174(2016). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。